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STM8L151C4 Scheda tecnica(PDF) 71 Page - STMicroelectronics

Il numero della parte STM8L151C4
Spiegazioni elettronici  8-bit ultralow power MCU, up to 32 KB Flash, 1 KB Data EEPROM RTC, LCD, timers, USART, I2C, SPI, ADC, DAC, comparators
PDF  101 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STM8L151C4 Scheda tecnica(HTML) 71 Page - STMicroelectronics

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STM8L151xx, STM8L152xx
Electrical parameters
Doc ID 15962 Rev 2
71/101
LSE crystal/ceramic resonator oscillator
The LSE clock can be supplied with a 32.768 kHz crystal/ceramic resonator oscillator. All
the information given in this paragraph is based on characterization results with specified
typical external components. In the application, the resonator and the load capacitors have
to be placed as close as possible to the oscillator pins in order to minimize output distortion
and startup stabilization time. Refer to the crystal resonator manufacturer for more details
(frequency, package, accuracy...).
Figure 13.
LSE oscillator circuit diagram
Table 27.
LSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE
Low speed external oscillator
frequency
32.768
kHz
RF
Feedback resistor
TBD
k
Ω
C(1)
Recommended load capacitance (2)
TBD
pF
IDD(LSE)
LSE oscillator power consumption
TBD(3)
µA
gm
Oscillator transconductance
TBD
µA/V
tSU(LSE)
(4)
Startup time
VDD is stabilized
ms
1.
C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD.
2.
The oscillator selection can be optimized in terms of supply current using a high quality resonator with a small Rm value.
Refer to crystal manufacturer for more details
3.
Data based on characterization results, not tested in production.
4.
tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation.
This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
OSC_OUT
OSC_IN
fLSE
CL1
CL2
RF
STM8
Resonator
Consumption
control
gm
Rm
Cm
Lm
CO
Resonator



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